Glass-polishing machine



1,626,026 AP"! 26 1927' c. w. DAKE 'ETZAL GLASS POLISHING MACHINE FiledOct. 2- 1 1922 2 .fqheets-Siieet 1 INVENTO/ffi- U/aarz Wflaa/Ze 0587335.Laws AP"! 26, 1927. t DAKE ET AL GLASS POLISHING MACHINE Filed Oct. 2,1922 '2 Sheets-Sheet 2 lU/l Patented Apr. 26, 1927.

UNlTED STATES PATENT OFFICE.

CHARLES W. DAKE AND ROBERT S. LEVIS, OF CHICAGO, ILLINOIS, ASSIGNORS TOTHE PYLE-NATIONAL COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEWJERSEY.

Application filed October 2, 1922.

Our invention relates to improvements in polishing machines forpolishing such objects as headlights, reflector bowls and the like. Ithas for one object to provide a multiple pad arrangement whereby aplurality of pads work across the face of the material to be polished,each of them assisting in the polishing. It has for another object toprovide a new and improved form of polishing head. Other objects willappear from time to time in the specification and claims.

Our invention is illustrated more or less diagrammatically, whereinFigure 1 is a side elevation of the head end of a polishing machine;

Figure 2 is a plan View looking in the direction of the arrow in Figure1;

Figure 3 is a detail part section of the polishing head.

Like parts are designated by like characters throughout thespecification.

A is a machine base mounted on supporting legs A projecting from it is abracket A carrying a bearing A for a spindle A which is adapted to berotated by any suitable source of power, not here shown. The spindleshaft is hollow as at A and carries at its end a fiat pneumatic chuckplate A upon which is carried a bracket or headlight reflector bowl Awhich is preferably held in position by a vacuum in the well knownmanner.

B is a polishing head bracket extending upwardly from the main base Aand held in position by the stay bar B. It carries a yoke B held inposition overlying the chuck. On this yoke is a hinged block B and onthis is pivoted an open frame B*. B is a bearing block provided withtrunnions B 13 pivoted in the frame B This bearing block is lined withanti-friction metal as at B and has rotatably mounted therein a stubshaft 13 screw threaded into the polishing wheel B 13 is a holding cappositioning the stub shaft 13 in the bearing block.

The polishing wheel has three projectlng spokes C each of themterminating in an enlarged sleeve C in which is removably mounted a stubshaft C and held in position by set screws C This stub shaft Cterminates in a reduced portion C and ball 0 C is a polishing blockhaving a spherical bearing surface to engage the ball (3.

GLASS-POLISHING MACHINE.

Serial No. 591,757.

C is a sleeve screwthreaded in the block C and having a sphericalsurface to engage the ball whereby the ball may be held in position onthe block C C is a rubber or other impervious bag supporting the bag Cand held on the face of the block by the screw threaded adjusting ringC, the arrangement being such as to provide an air tight pocket betweenthe rubber or other bag and part of the block which may be filled withcompressed air at any suitable pressure to provide a yielding supportfor the polishing pad. Three polishing pads are all similar and allthree of them engage the face of the work.

D is a lever extending outwardly from the frame B whereby weight may beap plied to increase the pressure of the engagement of the polishingpads with the work if that is desired.

It will be evident that while we have shown in our drawings an operatingdevice still many changes might be made in the size, shape andarrangement of parts without departing materially from the spirit of ourinvention and we wish therefore that the drawings be regarded as in asense diagrammatic.

The use and operation of our invention are as follows:

Then the work is positioned on the chuck and the previously inflatedpolishing pads have been swung down against the face of the work orsurface to be polished, the operator will start the machine to commencerotation of the work, and the three polishing pads all engaging the workwill immediately commence to polish. But because at any time one of thepads engage the work further out toward its periphery, there will be atendency for that pad to exert more force on the wheel than the otherand as a result the polishing wheel will rotate. As it rotates each padwill describe a spiral path across the face of the work and thus as thework goes on each pad will polish every part of the work.

Because the pads are inflated, the part of the polishing element incontact with the work will be forced thereagainst only by air pressureand thus the pressure will be the same for every unit of air of thepolishing pad and there will be'no tendency for deformation of the workbecause the work IJI itself controls the position and contour of thepad, the ball and socket joints making it easy for the parts to assumeany desired position.

e claim:

1. In a glass polishing machine, a mandrel upon which the Work ismounted for rotation, a spider mounted for rotation about an axisinclined to the axis of rotation of the Work, a plurality of separatepolishing pads mounted each for rotation upon the spider adapted toengage the Work, the pads being free to oscillate to conform to thesurface of the work, each pad being rotatably mounted upon the spider, apivoted support for the spider, the spider being free to move toward andfrom the Work.

2. In a glass polishing machine, a mandrel upon Which the Work ismounted for rotation, a spider mounted for rotation about an axisinclined to the aXis of rotation of the Work, a plurality of separatepolishing pads mounted each for rotation upon the spider adapted toengage the Work, the

pads being free to oscillate to conform to Signed at Chicago, Illinois,this 23rd day of September, 1922.

CHARLES V. DAKE. Signed at Chicago, Illinois, this 23rd day ofSeptember, 1922.

ROBERT S. LEVIS.

